fuse2fs: implement zero range

Implement FALLOC_FL_ZERO_RANGE.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Link: https://lore.kernel.org/r/174553064980.1160461.9850792727586596449.stgit@frogsfrogsfrogs
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

diff --git a/misc/fuse2fs.c b/misc/fuse2fs.c
index 7bd9bfa..751e66b 100644 (file)
--- a/misc/fuse2fs.c
+++ b/misc/fuse2fs.c
@@ -123,6 +123,12 @@ static ext2_filsys global_fs; /* Try not to use this directly */
 # define FL_PUNCH_HOLE_FLAG (0)
 #endif
 
+#ifdef FALLOC_FL_ZERO_RANGE
+# define FL_ZERO_RANGE_FLAG FALLOC_FL_ZERO_RANGE
+#else
+# define FL_ZERO_RANGE_FLAG (0)
+#endif
+
 errcode_t ext2fs_run_ext3_journal(ext2_filsys *fs);
 
 #ifdef CONFIG_JBD_DEBUG                /* Enabled by configure --enable-jbd-debug */
@@ -3619,6 +3625,16 @@ static int punch_helper(struct fuse_file_info *fp, int mode, off_t offset,
        return 0;
 }
 
+static int zero_helper(struct fuse_file_info *fp, int mode, off_t offset,
+                      off_t len)
+{
+       int ret = punch_helper(fp, mode | FL_KEEP_SIZE_FLAG, offset, len);
+
+       if (!ret)
+               ret = fallocate_helper(fp, mode, offset, len);
+       return ret;
+}
+
 static int op_fallocate(const char *path EXT2FS_ATTR((unused)), int mode,
                        off_t offset, off_t len,
                        struct fuse_file_info *fp)
@@ -3637,7 +3653,9 @@ static int op_fallocate(const char *path EXT2FS_ATTR((unused)), int mode,
                ret = -EROFS;
                goto out;
        }
-       if (mode & FL_PUNCH_HOLE_FLAG)
+       if (mode & FL_ZERO_RANGE_FLAG)
+               ret = zero_helper(fp, mode, offset, len);
+       else if (mode & FL_PUNCH_HOLE_FLAG)
                ret = punch_helper(fp, mode, offset, len);
        else
                ret = fallocate_helper(fp, mode, offset, len);